Chapter 4 - Central Tendency

Question 1

µ

Answer 1

Population mean

Question 2

x̄

Answer 2

Sample mean

Question 3

Mean

Answer 3

Very sensitive to extreme scores

Can be computed on interval and ratio data

Cannot on ordinal and nominal data

Cannot be used with indeterminate values

Question 4

Median

Answer 4

the value below which 50% of the scores fall

Less sensitive to unbalanced extreme scores

More accurate measure of central tendency

Can be computed on ratio, interval and ordinal data

But not nominal data

Question 5

Mode

Answer 5

The most frequently occurring score in the distribution

Can have more than one mode

Least useful measure of central tendency

Question 6

Range

Answer 6

The difference between the highest score and lowest score in the distribution

Question 7

Deviation score

Answer 7

Tells us how far a raw score is from the mean of the distribution

Question 8

Standard deviation σ

Answer 8

Measure of the average deviation of raw scores from the mean

Is sensitive

Question 9

N-1

Answer 9

Unbiased estimator of the population standard deviation. A sample is less likely to cover as broad of a range of scores as we are concerned with.

Question 10

Variance σ2

Answer 10

Symbolized by s^2

Provides a measure of how much the scores deviates from the mean.